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target/loongarch: Add GDB support for loongarch32 mode 

GPRs and PC are 32-bit wide in loongarch32 mode.

Signed-off-by: Jiajie Chen <c@jia.je>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-ID: <20230817093121.1053890-4-gaosong@loongson.cn>
[PMD: Rebased, set gdb_num_core_regs]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230821125959.28666-9-philmd@linaro.org>
This commit is contained in:
Jiajie Chen 2023-08-21 14:59:59 +02:00 committed by Song Gao
parent 6cbba3e9eb
commit ebda3036e1
No known key found for this signature in database
GPG Key ID: 40A2FFF239263EDF
4 changed files with 81 additions and 8 deletions
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2
configs/targets/loongarch64-softmmu.mak
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@ -1,5 +1,5 @@
TARGET_ARCH=loongarch64 TARGET_ARCH=loongarch64
TARGET_BASE_ARCH=loongarch TARGET_BASE_ARCH=loongarch
TARGET_SUPPORTS_MTTCG=y TARGET_SUPPORTS_MTTCG=y
TARGET_XML_FILES= gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu.xml TARGET_XML_FILES= gdb-xml/loongarch-base32.xml gdb-xml/loongarch-base64.xml gdb-xml/loongarch-fpu.xml
TARGET_NEED_FDT=y TARGET_NEED_FDT=y

45
gdb-xml/loongarch-base32.xml Normal file
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@ -0,0 +1,45 @@
<?xml version="1.0"?>
<!-- Copyright (C) 2022 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved. -->
<!DOCTYPE feature SYSTEM "gdb-target.dtd">
<feature name="org.gnu.gdb.loongarch.base">
<reg name="r0" bitsize="32" type="uint32" group="general"/>
<reg name="r1" bitsize="32" type="code_ptr" group="general"/>
<reg name="r2" bitsize="32" type="data_ptr" group="general"/>
<reg name="r3" bitsize="32" type="data_ptr" group="general"/>
<reg name="r4" bitsize="32" type="uint32" group="general"/>
<reg name="r5" bitsize="32" type="uint32" group="general"/>
<reg name="r6" bitsize="32" type="uint32" group="general"/>
<reg name="r7" bitsize="32" type="uint32" group="general"/>
<reg name="r8" bitsize="32" type="uint32" group="general"/>
<reg name="r9" bitsize="32" type="uint32" group="general"/>
<reg name="r10" bitsize="32" type="uint32" group="general"/>
<reg name="r11" bitsize="32" type="uint32" group="general"/>
<reg name="r12" bitsize="32" type="uint32" group="general"/>
<reg name="r13" bitsize="32" type="uint32" group="general"/>
<reg name="r14" bitsize="32" type="uint32" group="general"/>
<reg name="r15" bitsize="32" type="uint32" group="general"/>
<reg name="r16" bitsize="32" type="uint32" group="general"/>
<reg name="r17" bitsize="32" type="uint32" group="general"/>
<reg name="r18" bitsize="32" type="uint32" group="general"/>
<reg name="r19" bitsize="32" type="uint32" group="general"/>
<reg name="r20" bitsize="32" type="uint32" group="general"/>
<reg name="r21" bitsize="32" type="uint32" group="general"/>
<reg name="r22" bitsize="32" type="data_ptr" group="general"/>
<reg name="r23" bitsize="32" type="uint32" group="general"/>
<reg name="r24" bitsize="32" type="uint32" group="general"/>
<reg name="r25" bitsize="32" type="uint32" group="general"/>
<reg name="r26" bitsize="32" type="uint32" group="general"/>
<reg name="r27" bitsize="32" type="uint32" group="general"/>
<reg name="r28" bitsize="32" type="uint32" group="general"/>
<reg name="r29" bitsize="32" type="uint32" group="general"/>
<reg name="r30" bitsize="32" type="uint32" group="general"/>
<reg name="r31" bitsize="32" type="uint32" group="general"/>
<reg name="orig_a0" bitsize="32" type="uint32" group="general"/>
<reg name="pc" bitsize="32" type="code_ptr" group="general"/>
<reg name="badv" bitsize="32" type="code_ptr" group="general"/>
</feature>

10
target/loongarch/cpu.c
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@ -726,8 +726,18 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
#endif #endif
} }
static gchar *loongarch32_gdb_arch_name(CPUState *cs)
{
return g_strdup("loongarch32");
}
static void loongarch32_cpu_class_init(ObjectClass *c, void *data) static void loongarch32_cpu_class_init(ObjectClass *c, void *data)
{ {
CPUClass *cc = CPU_CLASS(c);
cc->gdb_num_core_regs = 35;
cc->gdb_core_xml_file = "loongarch-base32.xml";
cc->gdb_arch_name = loongarch32_gdb_arch_name;
} }
static gchar *loongarch64_gdb_arch_name(CPUState *cs) static gchar *loongarch64_gdb_arch_name(CPUState *cs)

32
target/loongarch/gdbstub.c
View File

@ -34,16 +34,25 @@ int loongarch_cpu_gdb_read_register(CPUState *cs, GByteArray *mem_buf, int n)
{ {
LoongArchCPU *cpu = LOONGARCH_CPU(cs); LoongArchCPU *cpu = LOONGARCH_CPU(cs);
CPULoongArchState *env = &cpu->env; CPULoongArchState *env = &cpu->env;
uint64_t val;
if (0 <= n && n < 32) { if (0 <= n && n < 32) {
return gdb_get_regl(mem_buf, env->gpr[n]); val = env->gpr[n];
} else if (n == 32) { } else if (n == 32) {
/* orig_a0 */ /* orig_a0 */
return gdb_get_regl(mem_buf, 0); val = 0;
} else if (n == 33) { } else if (n == 33) {
return gdb_get_regl(mem_buf, env->pc); val = env->pc;
} else if (n == 34) { } else if (n == 34) {
return gdb_get_regl(mem_buf, env->CSR_BADV); val = env->CSR_BADV;
}
if (0 <= n && n <= 34) {
if (is_la64(env)) {
return gdb_get_reg64(mem_buf, val);
} else {
return gdb_get_reg32(mem_buf, val);
}
} }
return 0; return 0;
} }
@ -52,15 +61,24 @@ int loongarch_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n)
{ {
LoongArchCPU *cpu = LOONGARCH_CPU(cs); LoongArchCPU *cpu = LOONGARCH_CPU(cs);
CPULoongArchState *env = &cpu->env; CPULoongArchState *env = &cpu->env;
target_ulong tmp = ldtul_p(mem_buf); target_ulong tmp;
int read_length;
int length = 0; int length = 0;
if (is_la64(env)) {
tmp = ldq_p(mem_buf);
read_length = 8;
} else {
tmp = ldl_p(mem_buf);
read_length = 4;
}
if (0 <= n && n < 32) { if (0 <= n && n < 32) {
env->gpr[n] = tmp; env->gpr[n] = tmp;
length = sizeof(target_ulong); length = read_length;
} else if (n == 33) { } else if (n == 33) {
env->pc = tmp; env->pc = tmp;
length = sizeof(target_ulong); length = read_length;
} }
return length; return length;
} }